Open Access8 kHz linewidth, 50 mW output, full C-band wavelength tunable DFB LD array with self-optical feedback
Author(s) -
Keisuke Kasai,
Masataka Nakazawa,
Masahito Ishikawa,
Hiroyuki Ishii
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.005675
Subject(s) - laser linewidth , optics , materials science , optoelectronics , optical circulator , wavelength , circulator , laser , optical power , relative intensity noise , physics , semiconductor laser theory
We describe a 1.5 μm, narrow linewidth, high output power wavelength tunable LD that employs a self-optical feedback circuit. By incorporating an optical circulator-based feedback circuit in a DFB LD array, we have successfully reduced the oscillation linewidth from several MHz to less than 8 kHz over the full C-band range. A high output power of approximately 50 mW and a low relative intensity noise of less than -130 dB/Hz were simultaneously achieved. Furthermore, by employing a partial reflection mirror as a self-optical feedback circuit, we have also realized a full C-band wavelength tunable LD with a linewidth of less than 11 kHz and a simple laser configuration.